Plastering and waterproofing in one step.IZONIL HARD is an extremely waterproof dry plaster mixture that will create a waterproof barrier after application; while it stays breathable at the same time. Hydrophobic ingredient IzoComponent HARD is the key component that ensures waterproof characteristic of the product. IZONIL HARD offers a permanent solution by eliminating the problems of water leakage. The plaster is produced from natural materials and does not contain any harmful or inflammable ingredients and it is environmental friendly, making it also possible for waterproofing drinking water tanks.